228 On a mass of Native Iron. 



2-49 grains of the protoxide ; equivalent, according to the atomic 

 numbers of Dr THOMSON, to T904 grains, or 6*618 per cent, of 

 metallic nickel. 



I could detect no trace of chromium, manganese, copper, or 

 any other substance ; and therefore, the specimen presented to 

 the Society by Mr ALLAN, consists of iron, nickel and cobalt, in 

 the following proportions : 



Iron ...... 93-4 



Nickel 6-618 



Cobalt 0-535 



100-553 



The result of this analysis is, I apprehend, decisive concern- 

 ing the origin of the specimen before the Society ; for while it 

 differs from any compound hitherto discovered in the earth, it 

 corresponds exactly both in appearance and composition with 

 other masses of meteoric iron. Professor STROMEYER some years 

 ago detected the presence of cobalt in a specimen of meteoric 

 iron from the Cape of Good Hope ; and he informs me, that, in 

 an elaborate investigation of these singular metallic masses, he 

 has detected cobalt as well as nickel in every specimen which he 

 has analysed. 



